Arthur strengthened to a Category 2 storm with winds of 100 mph Thursday evening before passing over the southern end of the Outer Banks — a 200-mile string of narrow barrier islands with about 57,000 permanent residents. The islands are susceptible to high winds, rough seas and road-clogging sands, prompting an exodus that began Wednesday night.

The storm was moving northeast Friday morning after turning slightly west late Thursday, which increased the threat to mainland communities from flooding, tornadoes and intense winds.

But officials in some coastal areas in North Carolina reported few problems Friday morning.

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Emerald Isle along the Bogue Banks posted on its website that the July 4th fireworks were still scheduled for Friday evening. The curfew also was lifted. Dare County officials said the northern end of the county, where Kill Devil Hills and Kitty Hawk, are located had reopened.

Hatteras Island on the southern end remained closed because of flooding on North Carolina Highway 12.

Jesse and Carol Wray could see outside their home in Salvo on North Carolina Highway 12 that the road was submerged under several feet of water Friday morning. The six-foot-tall lamppost at the end of their driveway was under water except for its top, and that was after the sound a quarter-mile away receded several feet since first light, said Jesse Wray, 68, a retired Norfolk, Virginia, firefighter.

“I’m surprised that it got this bad. There’s all kind of debris floating around here. I know a lot of people who lost their houses around here” if they were built on the ground instead of elevated, Jesse Wray said. Wray’s home is on pilings nine feet off the ground and avoided water inside.

About seven miles south on the island, Frank Folb, 70, said his brick home on a rise in Buxton suffered no damage. Tomato plants in his garden were twisted and broken, but “overall it’s not bad,” he said. “I’ve been losing electricity but I slept through the night pretty well.”

Paul Wernock said water about 3 feet deep surrounded his Rodanthe, North Carolina, home but was receding early Friday. “We have one giant mess” from tree damage and debris, but no obvious structural damage to homes on his side street, he said.

Up to more than 22,000 were without power across the Carolinas early Friday, according to Duke Energy’s website.

Before the storm hit, tourism officials had expected 250,000 people to travel to the Outer Banks for the holiday weekend.

After passing over North Carolina early Friday, Hurricane Arthur was expected to weaken as it traveled northward and dump rain along the East Coast. The annual Boston Pops Fourth of July concert and fireworks show were held Thursday night just before of a heavy downpour from Arthur, while fireworks displays in New Jersey and Maine were postponed until later in the weekend.

As of 7 a.m. EDT Friday, Arthur was centered about 65 miles east-northeast of Kitty Hawk, North Carolina, and 95 miles east-southeast of Norfolk, Virginia. It was moving northeast near 23 mph.

Liz Browning Fox, her 84-year-old mother, her dog and 27 homing pigeons were staying home rather than evacuating their home in Buxton, one of seven villages on low-lying Hatteras Island where officials ordered evacuations ahead of the storm. She, her neighbors and officials worried Arthur could bury the only road off the island in sand or salt water, or slice it with a new channel linking the ocean and sound as happened twice in recent years.

“The road getting cut off, the power lines getting cut off, the food getting cut off, that’s the big issues. And that’s for everyone on the island,” said Fox, 60. But she said she stays because she has “family all around. And more of them are older than I am rather than younger. Staying is just what we do.”

Arthur, the first named storm of the Atlantic season, prompted a hurricane warning from the southern North Carolina coast to the Virginia border. Tropical storm warnings were in effect for coastal areas as far north as Cape Cod, Massachusetts. A tropical storm watch was in effect for Nova Scotia in Canada.

Commanders at Seymour Johnson Air Force Base in Goldsboro, about 150 miles from the coast, sent four KC-135R Stratotankers and more than 50 F-15E Strike Eagles to another base near Dayton, Ohio, to avoid the risk of damage from high winds.